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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec426cda15b9b35e3a985e0730ceb3d71b82b51129158e2b04bde317e137dc1d' 
  AND token = 'QWSev2wz7PHB26sCmkt8Ajqivxuv5Dmfhd4bR6PXkYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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