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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5938a3e5a9a1584f6798fdf412f3b8350690c3472cd917b780d24a8411660202' 
  AND token = 'f9L3f2dkdR0j1nProA3SewRXGAfqC6rqFiz/NLNbNiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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