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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a159af79057a3cfafe88f859104881112efc1731521626e57cf1ef0e26807d3' 
  AND token = '36v8P9zuVKEtpncSVo7A3AuONiFHxZY4x3MkRf4OB/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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