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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b02c53851a6dab1a7d2f91bc93312893604e148ccc37c4cbc811aebe4518ed5' 
  AND token = 'gPEmuTrwomvA/Zz+I/kfGkh5UnyVxdT/Lh31tkxJOhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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