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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04006b79bb0faa10d878f0d4f26fe2fb8b4cdb5ca1678ec3d1b667ae468fb08e' 
  AND token = 'g+bJOFxeBFw853BDfmzwTV2FIXA5RxRQLlSmYVkWk1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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