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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62cf7f170deca7643ac4c52ad774c0c53b71f75bf2ef39d8d110a220b4f9212' 
  AND token = 'Efk/rWP1upuYDKOmMD2HeJp6hO0bi+fy47TqiAqO0Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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