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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ddbeb6d803080763749d30fd06f7b629f8827eb9e391b664f6c1816aadbba45' 
  AND token = 'vQwhMT3XwYDZLDYaQ2r8penUn/3bj9g/ky98BT/jvLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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