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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144e2d65ef1b789b050943b954aff33f3ebdc23ea137f2d772342d1145016003' 
  AND token = 'DqWDAJcdHy0q5eAHLzzoR0crY4my9jgDSx2vLirVHjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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