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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29107088ca289f4dd89df1e37ec952d490e315e7e280573f07d2c6769445508c' 
  AND token = 'ohoEDeYBvDRI9cAuK3iA5HhzrUl6zpxBb0LNvaq9SHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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