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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b0b82cde819f225e4d88cbebec355507442315c0ed10b0ccc17e0df5439f0a' 
  AND token = '0X2+uvnysibAkvjsufqHL6ZFyPq/RbY9Go4aGOOjxh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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