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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7fd13b91dccba414efed590a7553a28a8451babc2c4c086c081887dc86ef5bf' 
  AND token = 'D4lz7WS0r0gPxkW5dQIBbru+Af7DGEO0SrPR/lixcyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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