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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71fe90d36d6f1c57fc3662937c6ab9a77e8b33a45370a146e42ad2f9cfa579ee' 
  AND token = 'X79OwYcE7Fn5EEobV5AtZIdfTzXGJNfYhu7BH4cX3ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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