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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029aae158d1390ea4c1913dbc13bf004244ff90692fd707ab9276841df84f007' 
  AND token = 'XQqv1/dzc1uWu7rDQCJw8QYg9yPsqJF0SqmudPpCGow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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