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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa7e805d8085e7be6fc407e2f5c524ffb101f5f469b094b14c036eb47d87de5' 
  AND token = 'gqVpdvWJAy1MNanKsMuxvfmvk26tePGbRoqo04NOcBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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