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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5da66d2bedf64e1c83eb75126632d7d81da2a486e58fdf534e0048f373258287' 
  AND token = 'n9TTOc8zs1M3uxen/hzL9PLMFbX/pNjU4rLZ6BZuPHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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