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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5db1fe60b1097e50e98332b0344cf6bea2ad4023343288add4ceff4c02f8603' 
  AND token = 'Eon50AU5BSUFkXJ61Eeq4yVVDsNoXh2kJA0jBpYrwfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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