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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e19de02dddf8ad5d757b654bcd913366e976c2676424263e654049931bdfd9fe' 
  AND token = 'nXYd+SF/53yfpc3pi/1wB79hKAHzR77uJgGFbRr/SpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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