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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2af9a7adabf5d7712353eef5dc68258e55dc67c3da4b863ca9142f7d795b690d' 
  AND token = 'ulOU2mOVVAOq4UC9SitR5Anho2Q5Al81p0T/Ev6r5UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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