SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f642a780d0a9e62c8c78e07519ec5d74886b92b33078bb6c1c6292f5afa671' 
  AND token = 'SW4qUjqlvFRVypY2k4onsDoNO4DZCRh+++QEwpuPkFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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