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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d5a6407d2bebe8b27c156e0bb89a62e97be45769c9a8d631fe3fe739e9e897' 
  AND token = 'OJtB2TeyA/zqrb98U+Dtk7M/Flc4fmK+JCmKAMG30Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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