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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb9431aa05423e95a0a0ae6e6ed2f8e3ff746dd330260f7ac0b1a7444db1f542' 
  AND token = 'eceXa9Se6qt1vH85OpP5pbO0/P7Gt9dNeak4QsKElAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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