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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51fb19b7210c19559132390da4e59ce20e76a37b636acf3f4bf2bbe130a89d77' 
  AND token = 'S8CIrJgeEFYJShrJ/ZwArlAEv9Be8eiSwxpSxY54okQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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