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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f6e744ccc15d127ddbe5d80f68f4a42b84ad7c941fb831d8e61a8f6144c2b9' 
  AND token = 'xSC4EvUhQ0hS1nn8hLDn/HXL2rnVa15Tnzzg2XDBaFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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