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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74c24440944915efe24e786e35275a9af32b61dc8c1cf864bd0d0a9725cd3fa7' 
  AND token = 'awbx4Krj4Icr1a/xRcK0Hvof2rkkS4iLyEOUD4c8voU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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