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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00565a4b4f92ec51bf7d2367673f382a7f510b01e496767fd18a017080eec7d' 
  AND token = 'aBmftoyp1Fk5zFREK81qsKJ1fwWcPnDF7qLknX+GgAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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