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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e38a465657683ba2a0ebf5c8e559992773cff7541f1f212f1be3e74986f77c' 
  AND token = 'NU8DD3C/QxXAPGxbA4MMB2fNU9lpXQqX4imlwbBxWBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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