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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a6f5b80ec29656452bc8cf06602e7cd766dcae2d846ea58a0ef51458f1af10b' 
  AND token = 'wHytwyfzoXszE80RXTE72CIzO++w+iZocV3S+jWaP6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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