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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1a571bfcbc946505b5dfc502b0a20d37bb682a38fa49d259a64064c6ee50458' 
  AND token = 'AiFnbJGFZE6OemFhJmGF7DiyG226ZDFQLFNKdiSVOZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}