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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b18abe39e1bf35399f84c45a74060653979b473b71402dbc4d520a843a9e61' 
  AND token = 'DdlAc3ozRUMcbmLYWje6HPr1gSIAEw2h1i1cFWUDkIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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