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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db0d9067c3027a0d06e62b96be0f16de327bc62ea468369643e87eecb5ecb076' 
  AND token = 'gUhvWlrZOWUN5JnBHFg8397F/z4ttiXj0hP/+kg7bdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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