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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68945647fe1f5c84cb32ea910b61690afb4cd6738359ae4b17f025ef0616550' 
  AND token = 'WE1+u5C2dGfcxLM8gyEqunAnm9AjmeAQt7vLY7p5haI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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