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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f5599d5a5812930495efe07619897fa0b765c753efa38c2311c8feb33c7a44' 
  AND token = 'GL6s0M0dfI9WNrEhqq8kMudsB0Mg01zjJx9XmGeWf2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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