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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9d4cd238dd4e58c6b1b9252575fc4fe8c5e4e70c5e46b0fc385bebbb822b28' 
  AND token = 'y1Qbz1W2f0Q2BhkgPJV4pzK3H1o5V76GYi6Voc6757k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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