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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20830cbf9fb15bd4a88a2584bb15f898956a9ec76a23aa5ae9f22bfc5a7b1f9b' 
  AND token = '2avIPrBKoXg5PyjEb2CcRNaLIKWlAuDG1+vC2RP+a+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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