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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d460fca26c7bf38b40199dc69e2a9ce05ca31772b5afd31696c68d9c42d437f' 
  AND token = 'qVq/ila4na556Qqf0Dusxfe4HqfZjBevLu1/+eMuSh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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