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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7717c71e1c710d70d4441d8b43b0e0711dafe764be4ed5237a45e43d08d58fcb' 
  AND token = 'jk6YSwjn2unryUcBcyFCiwY65+pJSQrTsUCHpPxUgiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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