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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4598622b207f2d038ff71246744618463696f2b301fef8b74363997b1dcca25' 
  AND token = '9TlrlGXp2i4o4GZtlt4hsH/9KQ/dhwbjWrsKFYx11yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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