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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c69a3fa880455b14e1edf7d4e3c859420104fb2bfcddb9e7ccdc134d1856b0e' 
  AND token = 'g+Q0LSpB8R+L3KLMuh47R5edbfG7m9XBKgTk7Depxbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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