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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e6a1d8918ca5bab31ddfe0cffa2ad6319350d9716f6db2c484ce30d45d0daf' 
  AND token = '1Xz7WOqAf5YAoYA3wao9jzLesvJuDnL35kadPJA2ICw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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