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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7414fa54fa7d0647ec7462527a40482f576966db6ef04adf17ae954c33138c' 
  AND token = 'IzAimv5HxsGNg9Nq76uuFAiiM+vuPluYyC3bebiQUKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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