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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e123d7f8ce142ca60d807dfd0fa19e0a072738667a8e69b62100f934b5b5056' 
  AND token = 'sCNa0TAC81WQWsM0D0FGmPjWeklDehMHTcyJ+zRJCTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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