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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b55a1668d7661e4beab8f5587dd248d5968ec90ffb9c8a006cde31588d3d3190' 
  AND token = 'CKdcp3vwgPu3yVr5zGnn7sSleoMsqniuDMBibb5TVGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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