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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c87a87a41f1f76ad8cd0e08769e90a6ef3a592c14a26ab02937c7e54219ccdc7' 
  AND token = 'BBWdtF8xmBxES9XoIWkQJc0TKZTr6quJzy9r4CJhwKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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