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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed07c3b0ccfcd24b8b5865a0b0b833ca55b866f333822ecb945649ec7aa74b24' 
  AND token = 'QxdAXe0vY9bzO/Wrjuv/pSPtLEndjfPUor8x+UWRdAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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