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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc137dc32bea42aa48b4a6871e54e4e17175be7dd77942910ab6bc42e65d839' 
  AND token = 'Z+6IainTVdH4pjloGrfuPYJDxM2YZhF+2ZCr1IYitHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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