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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e564f2f47546f14fbdfb47e1e1cc89dc8299fc8d96e2e37d9fb8c7d8826dcd8a' 
  AND token = 'wA6f+HkMwxis9+Pwt23nSiXbS+7H9GGc3lXlcpFNgik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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