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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a35c19cabf4d59a229a4861d65c9c58ef194baf08e6fdf991c4740e809220a' 
  AND token = 'rpU/ljRmPo4FPDRkOYLD37ofCe/5zC6WCPT/je1OYTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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