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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d588226855e6a634973398688e0d56e3349e6284e986c5655bddb8ce1d6838' 
  AND token = 'wADRNg7DtKvm8gHB4RYHKwowJl7aad5Yh6Jct0PTDSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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