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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79055297372442a4e3976c503d8f3999fd45896b86c9240f141ac7933346fc20' 
  AND token = 'WLScp/pUfeMx7uslE2PN032BqfOcU9VaFwCBq88+w+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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