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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44340a064df8bbfec3e3f0418edb9c361e13caece315deeb29246334d2967c4' 
  AND token = 'CgD4OqT6w0CIIF8BeU5dOVSaqRX+QD/AnyvQLGMHGhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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