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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4fad6d14965e4cbb7a7613cdcb958a7417801602bb5a785c77d83aec3be458' 
  AND token = '9EWMMW06nv1sAIGpYhV/RP1b/EhBtyFLmF58oMbnQ7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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