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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '053d2dd8c56ecf3b02732d93d87bc7f898628c6c9d0cab440813704464a95d4b' 
  AND token = 'OYHUm5IG5786tLQrj2QXucvAQgCYtTcAI/RrqaKncLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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