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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90da563b041787ddbf3cda5dff8bc4d274bfea6965f512aec9b82cd6055fedc7' 
  AND token = 'okFFGnO2MoT3l36deiDjvzwlH4to/kLz1Hhmt2K/HBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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