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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b92b596633ff441b0fc4e78dcdb88c09c111c54a287d2ae869c360d5a420b38' 
  AND token = '+WY+C6a8wTJQnZANP2mOlXTKDkb3Ce9x0pDxwsLqXCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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