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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396e4546fca5134bfe33e373c40681387be099c53ff38b3832f0d4767b3b3851' 
  AND token = '8x6l4TecD/thpZouhr3eOfr129YgUggJgfxC5NWhqjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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