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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb56fbd71e6e3aab5df722caa87402ffe72f962f3943723ebdac9e7254db418' 
  AND token = 'nMPixZSLEFpI+mYzOSW/66Mg6QWZso8/Muc56Bn1RRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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