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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fb7b4a0e58ccf470a3c6de72d792e5c3753e163a971fca8bce3c52be1e8073' 
  AND token = 'FLItOhM44sPz7mAkG5em+T5O2a7cmvvRz6dkYMdpeP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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