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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c319f06f1cdb3ff48b3017c17fa3800ab6c5e55f7425865fb72e26efa4314a' 
  AND token = 'mTR2Y8pxxeLAvDiV09mJSxceConA4k7vmDBh6b47de4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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