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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa276484a2416552cf929980cd5f182670e590b44adc7ff508f0fb1911c4d6d5' 
  AND token = 'ptqF2J/BmZLXq+F8BPt7PjrAAQ9NIMc1cXO1pTM7MKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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