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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46928b9f62d3c9ff136c579d756d48055e7277ca78f3f16224ab804093f5b20' 
  AND token = 'oT2ab6gxFMog0GoD/Q8phem1PxiG13LvmNSoiRqqp8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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